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The circle described on the line joining the points \( (0,1),(a, b) \) as diameter cuts the \( x \)-axis in points whose abscissa are roots of the equation:
\( \mathrm{P} \)
(A) \( x^{2}+a x+b=0 \)
(B) \( x^{2}-a x+b=0 \)
(C) \( x^{2}+a x-b=0 \)
(D) \( x^{2}-a x-b=0 \)
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